Climate and Average Weather Year Round in Collooney Ireland

In Collooney, the summers are cool; the winters are long, very cold, and wet; and it is windy and mostly cloudy year round. Over the course of the year, the temperature typically varies from 38°F to 64°F and is rarely below 30°F or above 71°F.

Based on the tourism score, the best time of year to visit Collooney for warm-weather activities is from early July to late August.

The warm season lasts for 3.1 months, from June 11 to September 14, with an average daily high temperature above 60°F. The hottest month of the year in Collooney is July, with an average high of 63°F and low of 54°F.

The cool season lasts for 4.0 months, from November 18 to March 17, with an average daily high temperature below 49°F. The coldest month of the year in Collooney is January, with an average low of 38°F and high of 45°F.

In Collooney, the average percentage of the sky covered by clouds experiences mild seasonal variation over the course of the year.

The clearer part of the year in Collooney begins around April 3 and lasts for 6.4 months, ending around October 14.

The clearest month of the year in Collooney is July, during which on average the sky is clear, mostly clear, or partly cloudy 45% of the time.

The cloudier part of the year begins around October 14 and lasts for 5.6 months, ending around April 3.

The cloudiest month of the year in Collooney is December, during which on average the sky is overcast or mostly cloudy 71% of the time.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Collooney varies throughout the year.

The wetter season lasts 4.1 months, from October 11 to February 14, with a greater than 43% chance of a given day being a wet day. The month with the most wet days in Collooney is January, with an average of 15.8 days with at least 0.04 inches of precipitation.

The drier season lasts 7.9 months, from February 14 to October 11. The month with the fewest wet days in Collooney is April, with an average of 10.0 days with at least 0.04 inches of precipitation.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. The month with the most days of rain alone in Collooney is January, with an average of 15.5 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 53% on January 3.

Rainfall

To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Collooney experiences some seasonal variation in monthly rainfall.

Rain falls throughout the year in Collooney. The month with the most rain in Collooney is November, with an average rainfall of 4.0 inches.

The month with the least rain in Collooney is April, with an average rainfall of 2.2 inches.

The length of the day in Collooney varies extremely over the course of the year. In 2024, the shortest day is December 21, with 7 hours, 20 minutes of daylight; the longest day is June 20, with 17 hours, 11 minutes of daylight.

The earliest sunrise is at 4:59 AM on June 17, and the latest sunrise is 3 hours, 54 minutes later at 8:54 AM on December 29. The earliest sunset is at 4:10 PM on December 13, and the latest sunset is 6 hours, 1 minute later at 10:11 PM on June 24.

Daylight saving time (DST) is observed in Collooney during 2024, starting in the spring on March 31, lasting 6.9 months, and ending in the fall on October 27.

The figure below presents a compact representation of key lunar data for 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases.

We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

The perceived humidity level in Collooney, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, remaining a virtually constant 0% throughout.

This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.

The average hourly wind speed in Collooney experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 5.5 months, from October 11 to March 29, with average wind speeds of more than 13.8 miles per hour. The windiest month of the year in Collooney is January, with an average hourly wind speed of 16.2 miles per hour.

The calmer time of year lasts for 6.5 months, from March 29 to October 11. The calmest month of the year in Collooney is July, with an average hourly wind speed of 11.4 miles per hour.

The predominant average hourly wind direction in Collooney varies throughout the year.

The wind is most often from the west for 2.5 months, from February 15 to April 29; for 4.8 months, from May 4 to September 27; and for 3.7 weeks, from October 30 to November 25, with a peak percentage of 43% on July 18. The wind is most often from the south for 5.0 days, from April 29 to May 4; for 1.1 months, from September 27 to October 30; and for 2.6 months, from November 25 to February 15, with a peak percentage of 38% on October 11.

Collooney is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.

The average water temperature experiences some seasonal variation over the course of the year.

The time of year with warmer water lasts for 3.1 months, from June 30 to October 1, with an average temperature above 57°F. The month of the year in Collooney with the warmest water is August, with an average temperature of 60°F.

The time of year with cooler water lasts for 3.9 months, from December 26 to April 21, with an average temperature below 49°F. The month of the year in Collooney with the coolest water is February, with an average temperature of 47°F.

To characterize how pleasant the weather is in Collooney throughout the year, we compute two travel scores.

The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Collooney for general outdoor tourist activities is from early July to late August, with a peak score in the last week of July.

The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Collooney for hot-weather activities is from mid July to early August, with a peak score in the third week of July.

Methodology

For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.

Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.

Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.

Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.

Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

The growing season in Collooney typically lasts for 9.4 months (285 days), from around February 27 to around December 8, rarely starting before January 19 or after April 1, and rarely ending before October 27 or after January 13.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

Based on growing degree days alone, the first spring blooms in Collooney should appear around May 19, only rarely appearing before May 5 or after June 5.

This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.

The average daily incident shortwave solar energy experiences extreme seasonal variation over the course of the year.

The brighter period of the year lasts for 3.4 months, from April 30 to August 11, with an average daily incident shortwave energy per square meter above 4.7 kWh. The brightest month of the year in Collooney is June, with an average of 5.7 kWh.

The darker period of the year lasts for 4.0 months, from October 21 to February 23, with an average daily incident shortwave energy per square meter below 1.5 kWh. The darkest month of the year in Collooney is December, with an average of 0.4 kWh.

For the purposes of this report, the geographical coordinates of Collooney are 54.183 deg latitude, -8.500 deg longitude, and 161 ft elevation.

The topography within 2 miles of Collooney contains significant variations in elevation, with a maximum elevation change of 525 feet and an average elevation above sea level of 169 feet. Within 10 miles contains significant variations in elevation (1,775 feet). Within 50 miles contains very significant variations in elevation (2,628 feet).

The area within 2 miles of Collooney is covered by grassland (58%), trees (26%), and herbaceous vegetation (12%), within 10 miles by grassland (50%) and trees (17%), and within 50 miles by grassland (36%) and water (24%).